cLock: Make the list of calendar entries scrollable (max. 10 entries)

This changes the rendering and calendar data aquiration quite drastically, as
a new widget service had to be introduced.

Change-Id: I5bcdaa952acde2caa5a3f04b2c8c98868fd7cbfb
cLock: minor code cleanups (remove unused imports/variables/dead code, explicit usage of default locale)

Change-Id: Ib570f492a5163089542871020eb9db0a19019951
Merge remote-tracking branch 'cm/cm-10.1' into jb-mr1